Base station



FIG. 1 is a perspective view of a base station;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left, side-elevational view thereof;

FIG. 4 is a right, side-elevational view thereof;

FIG. 5 is a front-elevational view thereof; and,

FIG. 6 is a rear-elevational view thereof.

The ornamental design for a base station, as shown and described.